"This thesis develops the basis for the design and construction of a power generation system for application in unmanned aerial vehicles (UAV) with quadrotor structures. This system is integrated by a power generation stage, with a two-stroke internal combustion engine of two Horse-Power (HP) coupled with a brushless Altern Current (AC) motor. In particular, we will focus more on the second stage which is rectification and voltage regulation. In this work, a three-phase controlled rectifier is proposed, modeled, and simulated for this purpose a robust adaptive control is implemented to regulate the output voltage."